Hi Remi.
Thanks for the Mogas availability information at Sywell that is good to know
as I plan to be there next weekend.
In answer to your point about the higher octane fuel at higher cost all I
can say is thanks for letting me know that it is suitable for my 912 engine
!.
Tim
On 29 August 2010 11:07, Guerner Remi <air.guerner@orange.fr> wrote:
>
>
> Hi all,
>
> Landing at Sywell last September for the LAA rally, I was surprised they
> had both 100LL Avgas and 82UL Mogas. I decided to take 20 liters of this
> -unknown to me- 82UL. This small quantity being mixed with about 50 liters
> of the fuel remaining, I thought I was not taking a big risk.
> Later I did some research on the internet and among available publications.
> This is what I found:
> 82UL has a MON (Motor Octane Number) of 82 and AKI (Anti Knock Index) of
> 87, which translate into a RON (Research Octane Number) of 92, as
> AKI=(RON+MON)/2.
> In their Operator's Manuals and applicable SI, Rotax provides the following
> instructions regarding the suitable fuels:
> 912 UL: minimum RON: 90 or minimum AKI: 87
> 912 ULS and 914UL: minimum RON: 95 or minimum AKI: 91
> So it is clear that 82UL is not suitable for the 912 ULS and 914.
> In order to confirm this conclusion, could anyone provide a detailed
> specification of this 82UL Mogas as supplied in the UK?
> Other questions: is there any ethanol in this fuel? Why they do not supply
> Premium or Premium Plus / Super, whatever they call it, which would offer
> the higher octane rating we need for the 912S and 914, with only a slight
> cost increase?
>
> Comments please!
>
> Regards
> Remi Guerner
> F-PGKL
>
>
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